Dipper tooth



Nov. 4, 1930. w. s, MCKEE ET Ax.v 1?780,397 DIFFER TOOTH Filed Aug. 29. 1928 2 Sheets-Sheet l l I A? F iff 1X0 if OTTLQUS Nov. 4, 1930. w. s. MCKEE ET AL j 1,780,397 DIFFER TOOTH 4` l 2 Sheet-s-Sheet 2v Filed Aug. 29, 1928 @Re f? @g2/5%( gown/eggs Patented Nov. 4.1930

UNITED STATES PATENT 'ol-FICE 'WALTER S. MCKEE AND EUGENE C. BAUER, CHICAGO, ILLINOIS, ASSIGNOR TO KEN- SINGTON STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS DIPPER TOOTH Application ed August 29, 1928. Serial No. 302,668.J

on the base, to prevent speading of the bifurcated ends of the base, and to relieve the locking means which holds the parts together from lateral strains during the digging operations.

rlhe combined base and point form a continuous wedge which tapers to a forward cuttingl edge. The vbase portion terminates in a wedge-shaped nose, the sides of which con.- verge rnore rapidly than the sides of the tooth, the nose being bifurcated at right angles to the wedge to form two similar forwardly projecting arms. The ends of these arms are cut away externally so as to leave inner projections which are received in a pocket formed in the point so that spreading of the arms is prevented. The wedgeshaped point is cut away at the sides to re ceive the arms of the nose, leavingjaw portions at the diverging sides of the wedge which engage the sides of the wedge-shaped nose-arms. A-web connects the jaw portions, this web being received in the space between the arms of the nose. A tongue projects rearwardly as a continuation of this web, the tongue being received in a central recess formed in the base, and wedge-shaped locking means is passed through mating'openings in the tongue and base to lock the two portions of the tooth together. Furthermore, inter-engaging ledges and recesses are formed on the overlapping portions of the base and point. to accept lateral strains and relieve the tongue and locking means.

The principal object of this invention isy to provide an improved dipper tooth such as briefly ldescribed hereinabove, and disclose"y more in detail in the description which foilows.

@ther objects and advantages of this in.-

: vention will be more apparent from the tollowing detailed description of several approved orms of the device.

In the accompanying drawings: Fig. 1 is a plan view of one of the improved dipper teeth, with the parts assembled and mounted on the dipper body.

Fig'. 2 is a side elevation of the tooth shown in Fig. 1.

Fig. 3 is a central vertical section through the tooth, the view being taken substantially on the line 3-3 of Fig. 1, and on an enlarged scale.

Fig. 4 is a transverse longitudinal section, taken substantially on the line 4 4 of Fig. 3.

Fig 5 is a perspective View of the locking pm.

Fig. 6 is a perspective view of the nose portion of the base.

Fig. 7 is a perspective view of the reversible point.

Fig. 8 is a view similar to Fig. 3, showing a modified form of locking pin.

Fig. 9 is a view similar to Fi 4., showing another modification of the locking device.

A fragment or an excavating dipper is indicated at 1, and jaws 2 and 3 at the rear of the base portion ot the dipper tooth are secured to opposite sides of the edge of the dipper l, in the usual manner. it is understood that a plurality of these teeth are mounted in spaced parallel relation along the edge of the dipper.

form two parallel wedge-shaped arms 9.

rlhe outer end ot each arm 9 is out away or shouldered as indicated'at 10, so as to, leave inner forward projections or ingers 11. rlihe inner sides of arms 9 are recessed as indicated at 12 to provide shoulders 13. A central rectangular recess 14 projects rearwardly into the base member from the bottom of the base 8 between the arms 9 of the nose.

The outer sides 15 of the point 5 diverge continuously from the cutting edge 6. The other wedge-shaped sides of point 5 are recessed as at 16 to receive the arms 9 of the base, leaving jaws 17 which fit against the diverging sides of the nose 7 of the base.` A vertical web 18 centrally connects the two jaws 17, web 18 being received in the space 8 between the arms 9 of nose 7. Ledges or shoulders 19 are formed at the sides of web 18, where the web joins the jaws 17, these ledges 19 being adapted to fit within the recesses 12 of the nose 7 and engage the shoulders 13. The engaging 'shoulders'13- and 19 Vaccept vertical stresses, thus relievmg the tongue and locking' means hereinafter described of these strains. Furthermore, the thickened portions formed by these ledges 19 assist the web 18 in reinforcing and strengthening the recessed rear end of point 5 between the jaws 17.

The jaws 17 are connected at their forward ends by side flanges 20, which are received within tlie outer recesses`10 in the ends of arms 9 of nose 7. Between the flanges 20, and in front of the base of web 18, the point 5 is cored out to form a pocket 21, in which.

are received the lingers or projections 11 at the forward extremities of arms 9 of the base. Separated recesses or pockets at each side of web 18 and behind the flanges 20 would be adequate for this purpose, but it is more expedient in forming and machining the point to connect these recesses in the form of a single pocket 21.

The central portion of web 18 projects rearwardly in the form of a rectangular tongue 22 adapted to fit within the central recess 14 of base 4, rearwardly of nose 7. Openings 23 and 24 in the top and bottom of base 4, are adapted to align with an open-v ing -25 formed in the tongue 22, these mating openings 23, 24 and 25 receiving the wedgeshaped locking pin 26, shown in perspective in Fig. 5. This pin 26 (in the form shown in Figs. 1 to 7), will have an oval cross section so as to obtain the requisite strength without having its smaller dimension large enough to require an unduly large opening 25 in the tongue 22. This pin 26 tapers from one en to the other, and the openings 23, 24 and 25 are so spaced in the inter-engaging members that as the smaller end of the pin is driven through the mating openings the point 5 will be drawn snugly into engagement with the base 4. The smaller end of pin 26 may be bifurcated to form forks 27 which are spread within the enlarged outer end 28 of opening 24 so as to lock the pin in place.

In the modification shown in Fig. 8, the smaller end of wedge pin 26 is threaded as at 29 to receive a nut 30, which is housed within the opening 31 in base member 4 when the parts are assembled. A rib 32 may be formed on base 4 to protect the adjacent threaded end of the locking pin.

In the modification shown in Fig. 9, the mating openings 33, 34 and 35 formed in the base and tongue extend horizontally through these members instead of vertically as in the first described modification. The locking in 36 may be similar to either of the forms rst described, except that it will be somewhat shorter since itpasses through a narrower portion of base member 4.

It will be noted that the upper and lower halves of the point 5 are symmetrical, so that the point may be reversed to equalize the wear on the two halves thereof.

The spaced jaws 17 of point 5 arestrengthened and prevented from separating by the connecting web 18, the jaws being further reinforced by the thickened portions or ledges 19. `The arms 19 of the bifurcated nose 7 are prevented from spreading laterally by the engagement of the fingers or projections 11 within the pockets 21 behind side flanges 2O of point-5. The tongue 22 and locking pin 26 are relieved from vertical stresses by the engagement of shoulders 13 and 19 on the respective base and point members. The principal function ofthe tongue 22 is to hold the point in place upon the base member, and the use of this tongue permits the locking pin to be placed rearward of the inter-engaging side arms and jaws of the base 4and point members so that these members are not unnecessarily weakened by the openings that would be necessary if the locking pin were glaced through either the arms 9 or jaws 17.

ince these portions of the inter-locking Abase and point need not be made suliiciently thick to accommodate a locking pin, the entire tooth. may be made narrower, that is having a longer taper than would otherwise be possible.

We claim:

1. A dipper tooth comprising a base and a removable point, said point having top and bottom' surfaces diverging from a forward cutting edge, the wedge shaped sides being recessed to form upper and lower diverging jaws connected by a central vertical web, there being side flanges connecting the forward ends-ofthe jaws at each side of theV point, and pockets projecting forwardly into the point between the web and side flanges, and a central tongue projecting rearwardly from the web, the base being formed with a tapered noseportion adapted to be received between the jaws of the point, the'nose being bifurcated to receive the web, the front ends of the arms of the nose being externally recessed to engage the side flanges of the point and to provide inner projections that are received within the pockets of the point, there being a rearwardly extending central recess 1n the base to receive thetongue, there being `jaws connected b j member received in said openings.

mating transverse openings formed in the base and tongue, and a locking member received in said openings.

A dipper tooth comprising a base and a removable point, said point having top and bottom surfaces diverging from a forward cutting edge, the wedge shaped sides being recessed to form upper and lower di verging jaws connected by a central vertical web, there being side flanges connecting the forward ends of the jaws at each side-of the point, and pockets-projecting forwardly into the point between the web and side flanges, and a central tongue projecting rearwardly from the web, the base beingformed with a tapered nose portion adapted to be received between the jaws of the point, the nose being bifurcated to receive the web, the front ends of the arms of the nose being externally recessed to engage the side flanges of the point and to provide inner projections that are received within the pockets of the point, there being a rearwardly extending central recess in the base to receive the tongue, there being mating transverse openingsl formed in the base and tongue, a wedge-shaped locking pin received in said openings, there being an enlargement at theouter end of one opening in the base, and means received in the enlargement for locking the smaller end of the wedge pin therein. 1

3. A dipper tooth comprisingla .base and removable point, said point having top and bottom surfaces diverging 'from a forward cutting edge, the wedge shaped sides being recessed to form upper and lower diverging jaws connected by a central vertical web,

there being side `flanges connecting the for- `ward ends of the jaws at each side of the point, and pockets projecting forwardly into the point between the web andside anges, and a central tongue projecting rearwardly from the web, the base being formed with a tapered nose portion adapted to be received between the jaws of the point, the nose being bifurcated to receive the web, the front ends of the arms of the nose being externally recessed to engage the side flanges of the point and to provide inner projections that are received within the pockets of the point, there being a rearwardly extending central recess in the base to receive the tongue, thevarms of the nose and the jaws of the point being formed with interfitting ledges and recesses, there bein mating transverse openings formed in t e base and tgngue, and a locking el. A dipper tooth comprising a base and removable point, said point having top and bottom surfaces diverging from a forward cutting edge, the wedge shaped sides being recessed to form upper and lower diverging a central vertical web, there being side anges connecting the forward ends of the jaws at each side of the point, and pockets projecting forwardly into the point vbetween the web'and side flanges, and a central tongue projecting rearwardly from the web, the base being formed with a tapered nbse portion adapted to be received between the jaws of the point, the nose being bifurcated to'receive the web, the front ends ofthe arms of the nose being'externally recessed to engage the side flanges of the point and to provide inner projections that are received within the pockets of the point, there being a rearwardly extending central recess in the base to receive the tongue, the arms of the nose and the jaws of the point being formed with interfitting ledges and recesses,

vthere being mating transverse openings formed in the base and tongue, a wedgeshaped locking -pin received in said openings, there being anenlargement at the outer end of one opening in the base, and means received in the enlargement for locking the smaller end of the wedge pin therein.

5. A. dipper tooth comprising a base and removable point, said point having top and bottom surfaces diverging from -a forward cutting edge, the wedge shaped sides being re-` cessed to form upper and lower diverging jaws connected by a central vertical web, there being side flanges connecting forward ends of lthe jaws at each side of the point, and pockets projecting forwardly into the point between the web and side flanges, inwardly projecting ledges formed on the jaws at the sides of the web, and a central tongue proj ecting rearwardly from the web, the base being formed with .a tapered nose portion adapted to be received between the jaws of the point, the nose being bifurcated to receive the web, the diverging sides of the nose being recessed to`receive the ledges in the point, the front ends of the arms of the nose -being externally recessed to engage the side flanges of the point and to provide inner pron jections that are received within the pockets ofthe point, there being a rearwardly projecting central recess in the base to receive the tongue, there -being mating transverse openings in the base and tongue, and a wedgeshaped lockingpin received in said openings.

- 6. A dipper tooth comprising a base and removable points said point having top and bottom surfaces divergingV from a forward cutting edge, the wedgeshaped sides being recessed to form upper and lower diverging jaws connected by a central vertical web, there being side flanges connecting the forward'ends ofthe jaws at each side of the point, and pockets projecting forwardly into the point between the web and'side flanges, 'inwardly projecting ledges formed on theV jaws at the sides of the web, and a central tongue projecting rearwardly from the web, the base being formed with a tapered nose portion adapted to be received between the jaws of the point, the nose being bifurcated to receive the web, the diverging sides of the nose being recessed to receive the ledges in the point, the front ends of the arms of the nose being externally recessed to engage the side flanges of the point and to provide inner projections that are received Within the pockets of the point, there being a rearwardly projecting central recess in the base to receive the tongue, there being mating transverse openings in the base and tongue, a Wedgeshapcd locking pin received in said open# ings, there being an enlargement at the outer end of one opening in the base, and means received in the enlargement for locking the smaller end of the Wedge pin therein.

WALTER S. MCKEE. EUGENE C. BAUER. 

